Safety-stop for elevators.



J. HOPPER.

SAFETY STOP FOR ELEVATORS.

APPLICATION mum AUG.8, 1912.

1,072,008, Patented Sept. 2, 1913.

3 SHEBTS-SKBET 1.

o o m ".13

o o A 1 Z" wlTuE sTsss: M

W6 INVENTOR liiiig 7 z COLUMBIA PLANODRAPH CO.,WASIHNGTDN. u c

J. HOPPER.

SAFETY STOP FOR ELEVATORS. APPLIOATIONVIILED AUG.8,1912.

1,072,008. Patented Sept. 2,1913

3 SHEETS-SHEET 2.

O 1 O 10 i I Fl|3.4. o; e, ALB/A9,), H

9 t z t 9 I? 6 6 7 7 -5; ,v' 61 i Atty:

comma PLANOGRAPH not. WASHINGTON, n. x.

J. HOPPER.

SAFETY STOP FOR ELEVATORS.

APPLICATION FILED AUG.8, 1912.

1,072,008 Patented Sept. 2,1913.

3 SHEETS-SHEET 3.

14 4 4Q I 2 15a FIELE- a 1:10;; "1

;i A; z z Q 7 I 7 w o o o O 9 a o o o o 9 -13 8 8 l WITNESSESIL L 19 rmvgu'ron M yfmwm JOHNrHOFFER, OE FAIRMONT, WEST VIRGINIA.

SAFETY-STOP FOR ELEVATORS.

Specification of Letters Patent.

Patented Sept. 2, t 913.

Application filed August 8; 1912. Serial No. 714,114..

'1 t) MZZ rv/mot it may concern Be it known that I Jonn llonnou, residing at Fairmont, in the county of Marion and State of lVest Virginia,a citizen of AlistriaJlungary, have invented or discovered certain newand useful Improvements in Safety-Stops for l llevators, of whichimprovementsthe following is aaspecitication.

My invention relates to the construction of elevators provided withsafety devices consisting of cams adapted to engage the elevator guiderails and thereby arrest the descent of the ele 'ator upon the breakingof the sustaining cable.

The object of my invention is to provide a means for operating suchsafety devices which will be certain and ett'ectiveunder all conditionsof service, the elevator at the same time beingsecurely sustainedthrough out its normal operation.

A further object of'my invention is-to so coordinate the action of suchsafety devices, when used on freight or mine shaft elevators sustainedin pairs by a single cable and mm able in opposite directions, that thesafety cams of each elevator will, through a single 'instrurnentality,become effective simultaneonsly.

My invention, is illustrated in the accompanying drawings, which formpart of my.

specification, and in which- Figure 1 is a front. elevation of apassenger elevator; Fig. 2 is a side elevation of the elevator shown inFig. 1; Fig. 3 is an enlarged plan view of Fig. 1, showing in detail theconstruction of the safety device; Fig. l is a sectional view taken onthe line lV-lV l ig. 3; Fig. 5 is a sectional view taken on the line VV, Fig. 3; and Fig. (l is an elevation of a pair of freight or mineshaft elevators embodying certain features of my invention.

In the several figures like nmnerals are used to designate like parts.

.teferring particularly to Figs. 1 to 5 of the drawings, the elevatorcar 1 is suitably arranged to move between guides 2., and is sustainedby a supporting cable 3, which passes over a sheave 4t, mounted insuitable framework 5 at the top of the elevator shaft.

As heretofore constriuzted such elevator cars have been provided withsafety-cam stopping devices, which have been brought into operation uponthe breaking of the sustaining cable by springs or by weights. TheSpring-operated safety cams are lmcertain in. their action for thereason that the springs frequently bccomesct and fail to operate inthecase ofan emergency. ()n the other hand no structurally ellicient: meanshas as yet l)tBGIl ])l'()\'l(l((l 'fOl' using weights to bring thesafety-ca1ns into engagement. withthe guide, the elevator car at thesame time being securely and properly sustained throughoutits normaloperation.

Inthe elevator shown herein, two shafts (3 are-rotatably mounted in theupper por' tion of the-car 1, and to each end of each shaft atoothcdcamor eccentric 7 is rigidly secured; To each shaft (5 I also secure twoarms 8, such arms preferably being placed near the ends of the shaftsand extending toward the center: of -the car. A pair of leverst) arepivot-ed in suitable supports 10 securcdito the cross beam 11 of thecar, and between such. supports l secure straps l2 adaptedto extend overthe inner ends of said levers, as shown. The outer ends of the levers 9are slotted in order to receive the arms-S-whiclrcxtcnd through suchslots. At the outer end of each lever t) a rope or cable 13 is attached,eacln rope extending over sheavesl-l-a-nd15, and having a weight. 16secured to its ot-her end.

In the o cration of this elevator, the weight ofthe car is normally-arricd by the cable 3, which holds the lovers 5) in theirbearingpositions upon the straps '12. \Vhen the cable 3 breaks, or forsome other reason becomes slack, the weights 16, through the ropes 13,reverse the normal positions of the pivoted levers t), and in thisreverse movement the lovers cause the arms 8 of the cam shafts to beraised and thereby bring the cams 7 into engagement with the guides 2.It; will be seen that, in this particular arrangement, a very positiveand quick action of the safety cams is assured in case of accident tothe supporting cable. l urthermm'e, it will be seen that. during thenormal operation of the elevator, the car will be provided with astriu-tm'ally adequate support.

My invention has to do also with a particular arrangement of safety camoperating devices when used on freight or minev shaft elevators, thecars of which are sustaincd in pairs by a common cable, and

which move in opposite directions with rc-- lation to each other throughtheir rcspective shafts. As usually constructed. each elevator car ofsuch pairs 1s provided with independent means for effecting theoperation or setting of its safety cams upon the breaking of the commonsustaining cable. In order to eliminate one of such operating means andto thereby cheapen the cost of such elevators as well as render themsimpler in construction, I coordinate the cam operating means of bothelevator cars so that a single instrumentality becomes effective to settheir safety cams. My preferred means to this end is illustrated in Fig.6 of the drawings. The freight elevator cars 18 and 19, as showntherein, are suspended by a common cable 3 which passes over sheaves 4supported by suitable frames (not shown). The safety cams and theiroperating means are, in this disclosure, the same as those illustratedin Figs. 1 to 5 and described above. In order to move the levers 9 totheir reverse posit-ions, and thereby bring the cams 7 into engagementwith the guides 2 when the sustaining cable 3 breaks, I connect thelevers 9 of one elevator car to the corresponding levers 9 of the otherelevator car by means of ropes or cables 13 and 13, passing over sheaves14f and 15 at the top of the elevator shafts. The said ropes arepreferably so adjusted as to sustain none of the weight of the elevatorcars during the normal operation of the cars.

In case the sustaining cable 8 breaks a double safeguard is, by thisconstruction, provided against the falling of the elevator cars. Theropes may be of suflicient strength in themselves to sustain theelevator cars, but their primary function is to set the safety cams inthe manner described in connection with Figs. 1 to 5.

I claim as my invention:

1. In an elevator safety stop, the combination with an elevator carmovable between guides, of a pair of rotary mounted shafts each providedwith safety cams in positions to engage said guides, a sustaining cable,a pair of weighted cables, a pair of pivoted levers each connected atits inner end to said sustaining cable and at its outer) 1 end to one ofsaid weighted cables, arms extending from said cam shafts andoperatively engaged by said levers, and a pair of straps extending oneover the inner end of each lever and connected to said car.

2. In an elevator safety stop, the com-' over the inner end of eachlever and connected to said car.

In testimony whereof I have hereunto set my hand. 7

r 7 JOHN HOFFER.

Witnesses Gum E. Amos, S. W. BAKER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

